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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // parseInt 整数
        // parseFLoat 浮点数
        console.log(parseInt(""));      //NaN
        console.log(parseInt("3.14"));      //3
        console.log(parseInt("4.14"));      //4
        console.log(parseInt("abc123"));    //NaN
        console.log(parseInt("123abc"));      //123

    </script>
    
</body>
</html>